Exam Maths Puzzle Numerical Ability

The number of numbers of the form 30a0b03 where a,b are digits which are divisible by 13 is

(A) 5 (B) 6 (C) 7 (D) 8

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Exam Other Question

3+5+6=151872
5+5+6=253094
5+6+7=303585
5+5+3=251573
9+4+7=??????
what is the sum of 4 digits numbers formed by using digits 5,6,7,8 it is noted that repeation is not allowed